LIcense:

Audio Jungle
https://audiojungle.net/item/also-sprach-zarathustra-introduction/48092208

Audiostock
https://audiostock.jp/audio/252545

100Audio
https://100audio.com/en/download/1173880/?ref=22577

Also sprach Zarathustra Introduction (Virtual Orchestration / MIDI Mock-up)

LIcense:

Pond 5
https://www.pond5.com/royalty-free-music/item/250328545-tchaikovsky-nutcracker-suite-waltz-flowers?ref=tak_music

Audiostock
https://audiostock.jp/audio/1483836

100Audio
https://100audio.com/en/download/3547460/?ref=22577

Tchaikovsky The Nutcracker Suite Waltz Of The Flowers (Virtual Orchestration / MIDI Mock-up)

Pond 5
https://www.pond5.com/royalty-free-music/item/250627591-mozart-serenade-no13-eine-kleine-nachtmusik-allegro?ref=tak_music

Audiostock
https://audiostock.jp/audio/1484813

100Audio
https://100audio.com/en/download/3552847/?ref=22577

Mozart Serenade No13 Eine Kleine Nachtmusik Allegro (Virtual Orchestration / MIDI Mock-up)

This track is featured in an episode of Number Lore.
Enjoy watching it too! 
https://www.youtube.com/watch?v=rMKvv9fJuRE

"Goodbye" from Number Lore

約束 - Promise

https://www.youtube.com/watch?v=DMYJrlB3Pbs&feature=youtu.be
https://tak-music.tumblr.com